: MeSH: Lactose Intolerance

Congenital, Hereditary, and Neonatal Diseases and Abnormalities > Genetic Diseases, Inborn > Metabolism, Inborn Errors > Carbohydrate Metabolism, Inborn Errors > Lactose Intolerance

Nutritional and Metabolic Diseases > Metabolic Diseases > Metabolism, Inborn Errors > Carbohydrate Metabolism, Inborn Errors > Lactose Intolerance

Digestive System Diseases > Gastrointestinal Diseases > Intestinal Diseases > Malabsorption Syndromes > Lactose Intolerance

Nutritional and Metabolic Diseases > Metabolic Diseases > Malabsorption Syndromes > Lactose Intolerance

Lactose Intolerance

The condition resulting from the absence or deficiency of LACTASE in the MUCOSA cells of the GASTROINTESTINAL TRACT, and the inability to break down LACTOSE in milk for ABSORPTION. Bacterial fermentation of the unabsorbed lactose leads to symptoms that range from a mild indigestion (DYSPEPSIA) to severe DIARRHEA. Lactose intolerance may be an inborn error or acquired.

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